A) \[\frac{{{A}_{1}}+{{A}_{2}}}{2}\]
B) \[\sqrt{{{A}_{1}}{{A}_{2}}}\]
C) \[{{\left[ \frac{\sqrt{{{A}_{1}}}\,+\,\sqrt{{{A}_{2}}}}{2} \right]}^{2}}\]
D) \[{{\left[ \frac{1}{{{A}_{1}}}+\frac{1}{{{A}_{2}}} \right]}^{-1}}\]
Correct Answer: B
Solution :
Area of light source for two conjugate states of lens \[=\sqrt{{{A}_{1}}{{A}_{2}}}\]
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